Pencil sharpener



1930- w. BENCZALSKI PENCIL SHARPENER Filed Aug. 10, 1929 iiwezw m M192&2? 6? Patented Nov. 4, 1930 WOJCIECH BENCZALSKI, OF EUREKA, CALIFORNIAPENCIL SHARPENER Application filed August 10, 1929. Serial No. 384,989.

The present invention relates to pencil Sharpeners, its main objectbeing the provision of a compact device for sharpening penoils.

Another object of the present invention is the provision of a pencilsharpener inclosed within a casing and which may be readily 'insertableor removable therefrom. Y A still further object of the presentinvention is the provision of a pencil sharpener having a plurality ofcutting knives suitably formed and arranged to facilitate easy andprompt action.

A still further object of the present invention is the provision of thedevice of the characted indicated which may be easily and inexpensivelymanufactured.

Vith the above general objects in view and others that will appear asthe nature of the invention is better understood the same consists inthe novel construction, combination and arrangement of parts hereinaftermore fully described, illustrated in the accompanying drawings andpointed out in the appended claims.

In the drawing forming a part of this application, and in which likedesignating characters refer to corresponding parts throughout theseveral views,

Fig. 1 is a side elevation view in actual size of the device;

Fig. 2 is an enlarged longitudinal crosssectional view of the device;

Fig. 3 is a transverse cross-sectional view on line 33 of Fig. 2;

Fig. 4 is a transverse cross-sectional view on line 44: of Fig. 2;

Fig. 5 is a. transverse cross-sectional view on line 5-5 of Fig. 2;

Fig. 6 is a side elevational view of one of the knives used inconnection with the device; and

Fig. 7 is the edge View of the knife.

Referring in detail to the present drawing the device embraces a casingincluding cuplike section 10 and another bottle-shaped section 11 withconstricted neck portion 12. The cup-like section 10, adjacent its edgeand outwardly thereof is threaded and similarly the bottle-shapedsection 11 at its larger end is inwardly threaded so that the twosections may threadedly connect as at 13.

If desired portions of each of said two sections of the casing may becorrugated as at 14 for the purpose of facilitating manual connection ordisconnection of the two sections.

The device further includes a substantial-- ly semi-spherical head orblock 15 which is adapted to fit within the bottom of the cupshapedsection 10 of the casing wherein the same is frictionally held. Anothersubstantially semi-spherical block 16 is provided, the same beingslightly reduced to provide clearance between the same and thebottle-shaped section 11 of the casing so that there may be nointerference therebetween during the removal of the bottle shapedsection 11 from the cup-shaped section 10. Said outer block 16 at itscenter is provided with bore 17, which, during the assembled conditionof the device remains in alinement with the opening in the neck portion12 of the casing, permitting easy insertion or withdrawal of the pencil.

The inner block 15 is provided with four slots or grooves 18 which arearranged in crosswise radial formation on transverse plane through thesharpener, as seen on Fig. 3, for receiving therewithin wider ends 19 ofknives 20. These grooves 18, however, do not form a true cross, butmerely some of their faces form a true cross, the remaining portions ofsaid grooves being off-set in one circular direction, as clearly seen onFigs. 3 and 4. Thus the sharp inner edges of the knives at a pointadjacent block 15 meet, as seen on Fig. 3, so that during the sharpeningof the pencil the lead portion thereof will have a perfect sharpenedpoint.

As already indicated each of said knives 20 at their inner edges taperoutwardly and towards block 16, so that sharp edges 21 thereof are on aconical plane in their operative formation, as seen on Figs. 2 and 5.Furthermore each of said knives 20 is bent on 95 a line from which awider end 19 projects from the body portion of the knife and they areslightly twisted all in the same direction, so that the edges 21 thereofremain in an oblique relation to the axis of the device. This 100 arranement adds to the cutting action of each 'fe. The narrower end 22 ofeach knife is bent on a line from which the same immediately projectsfrom the body portion of the knife in the reverse direction from thebend of the wider end 19 of each knife, and said narrower ends 22 areinserted and frictionally held within grooves 23 which are likewisearranged in cross-wise radial formation in block 16 on transverse planethrough the sharpener. These latter grooves 23 remain in an oil-set orstaggered relation with res ect to the grooves 18 in block 15, as seenon i 2, due to the fact that each of knives 20 is longitudinallyobliquely bent with respect to the axis of the device as hereinabovedescribed.

From the above description it willbe seen that the device hereindisclosed is very simple in construction, all of its parts may bereadily disassembled, and the knives 20 may be readily separated fromtheir holding blocks 15 and 16 for the purposes of sharpening the samewhen necessary. The device has a further advantage in that the knivesand blocks 15 and 16 are inclosed within a casing so that pencilshavings collect within the casing, and when required the same may bereadily removed on disconnection of the two sections of said casing.

While there is described herein a preferred embodiment of the presentinvention it is nevertheless to be understood that minor changes may bemade therein without departing from the spirit and scope of theinvention as claimed.

What I claim as new is:

1. A pencil sharpener comprising a pair of blocks, a plurality of knivesmounted by their edges in said blocks, one of said blocks having acentral bore for inserting a pencil therethrough, said knives, at theirinner sharp edges tapering toward said last mentioned block, the bodyportions of said knives remaining in an oblique position relative to thelongitudinal axis of the sharpener.

2. A pencil sharpener comprising a pair of blocks, a plurality of knivesmounted by their ends in said blocks, said knives being in substantialradial arrangement on transverse plane through the sharpener, the innercutting edges of said knives being longitudinally tapered, a casingenclosing said blocks and said knives, one of said blocks being infrictional engagement with the casing, the other of said blocks having abore, the end of said casing adjacent said last named block beingconstricted and elongated for effecting a tubular extension, saidextension being in alinement with the bore in the last named block forproviding a communication with the inner sharp tapering edges of saidknives.

3. A pencil sharpener comprising a pair of blocks, a plurality of knivesmounted by their ends in said blocks, said knives being in substantialradial arrangement on transverse plane through the sharener, the innercutting edges of said knives eing longitudinally tapered, a casingenclosing said blocks and said knives, one of said blocks being infrictional engagement with the casing, the other of said blocks having acentral bore, the end of said casing adjacent said last named beingconstricted and elongated for effecting a tubular extension, saidextension being in alinement with the bore in the last named block forproviding a communication with the inner sharp tapering edges of saidknives, said casing being made of two disengageable sections.

4. A pencil sharpener comprising a pair of blocks, and a plurality ofknives, each of said blocks being provided with a number of groovescorresponding to the number of said knives, said grooves in each of saidblocks being arranged in radial formation with respect to each of saidblocks and being substantially at right angles with respect to eachother, the grooves in one of said blocks being in an ofl-set staggeredrelation with the grooves in the other of said blocks, said knives beingmounted at their ends within the grooves in the two blocks. I

5. A pencil sharpener comprising a pair of blocks, and a plurality ofknives, each of said blocks being provided with a number of groovescorresponding to the number of said knives, said grooves in each of saidblocks being arranged in radial formation with respect to each of saidblocks and being substantially at right 'angles with respect to eachother, the grooves in one of said blocks being in an off-set staggeredrelation with the grooves in the other of said blocks, said knives beingmounted at their ends within the grooves in the two blocks, the innercutting edges of said knives being longitudinally tapered, one of saidblocks having a central opening providing a communication with saidcutting edges of said knives.

In testimony whereof I afiix my signature.

WOJCIECH BENC ZAIJSKI.

